error email address when sign up to the early access list

[OutisLi]

Describe the bug
When I want to sign up for the early access, I tried several email address. But they all showed that: Please use a valid email address.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Additional context
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[Raman-79]

Made a PR for this issue
#389